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Posté : ven. 8 mai 2020 22:51
I have bought a Goerz Roll Tengor, and there are a number of features that are unclear.
The focusing scale can be set in two positions by sliding it forwards or backwards, labelled F and P - it moves about 5mm and locks in each position. The F position puts infinity at the focal length of the lens, the P position is 5mm rearwards of this.
What does this mean and how is it used? What does the 4100 mean? (this seems to be on other Tengors too)
The Compur shutter has round the lens 'D.R.P. (serial number) D.R.G.M' - what do these letters mean?
The feed spool housing has a well as the normal roller to guide the film onto the back plate a second roller below it - I can't see how the film is ever going to contact this roller - why is it there?
Posté : sam. 9 mai 2020 06:04
hi Wolstan, "F" is for "Film", and "P" for "Plate" (or something like that in German). To use plate, we need some adaptatorof 5 mm thick.
"DR.." is for "deutsch reich"..
(The acronym D.R.G.M. with or without punctuation stands for Deutsches Reichsgebrauchsmuster - Patent rights were secured by applying for a Deutsches Reichspatent (D.R.P.))
Posté : sam. 9 mai 2020 09:13
Ah ha - film or plate - I should have been able to get that! Yes, there was a plate adapter apparently, thanks.
So 'Patent' and 'Utility model'? What does 'utility' imply, seems a little odd to draw attention to it being basic? In Britain in WWII there were 'utility designs' but that was to indicate they were authorised under rationing. Was something similar going on in Germany in the late 1920's?
Still leaves the puzzle of the lower roller!
Posté : sam. 9 mai 2020 09:35
OK, I understand now - Patent, and Germany wide design registered for 3 years - 2 levels of protection. Thanks.
Posté : sam. 9 mai 2020 09:45
And as to the lower roller, on second examination with a film spool in place, I think it bears on the flanges of the spool as it is pulled upward by advancing the film.